projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 38db37ba MC |
1 | /* |
| 2 | * IEEE754 floating point arithmetic | |
| 3 | * double precision: CLASS.f | |
| 4 | * FPR[fd] = class(FPR[fs]) | |
| 5 | * | |
| 6 | * MIPS floating point support | |
| 7 | * Copyright (C) 2015 Imagination Technologies, Ltd. | |
| 8 | * Author: Markos Chandras <markos.chandras@imgtec.com> | |
| 9 | * | |
| 10 | * This program is free software; you can distribute it and/or modify it | |
| 11 | * under the terms of the GNU General Public License as published by the | |
| 12 | * Free Software Foundation; version 2 of the License. | |
| 13 | */ | |
| 14 | ||
| 15 | #include "ieee754dp.h" | |
| 16 | ||
| 17 | int ieee754dp_2008class(union ieee754dp x) | |
| 18 | { | |
| 19 | COMPXDP; | |
| 20 | ||
| 21 | EXPLODEXDP; | |
| 22 | ||
| 23 | /* | |
| 24 | * 10 bit mask as follows: | |
| 25 | * | |
| 26 | * bit0 = SNAN | |
| 27 | * bit1 = QNAN | |
| 28 | * bit2 = -INF | |
| 29 | * bit3 = -NORM | |
| 30 | * bit4 = -DNORM | |
| 31 | * bit5 = -ZERO | |
| 32 | * bit6 = INF | |
| 33 | * bit7 = NORM | |
| 34 | * bit8 = DNORM | |
| 35 | * bit9 = ZERO | |
| 36 | */ | |
| 37 | ||
| 38 | switch(xc) { | |
| 39 | case IEEE754_CLASS_SNAN: | |
| 40 | return 0x01; | |
| 41 | case IEEE754_CLASS_QNAN: | |
| 42 | return 0x02; | |
| 43 | case IEEE754_CLASS_INF: | |
| 44 | return 0x04 << (xs ? 0 : 4); | |
| 45 | case IEEE754_CLASS_NORM: | |
| 46 | return 0x08 << (xs ? 0 : 4); | |
| 47 | case IEEE754_CLASS_DNORM: | |
| 48 | return 0x10 << (xs ? 0 : 4); | |
| 49 | case IEEE754_CLASS_ZERO: | |
| 50 | return 0x20 << (xs ? 0 : 4); | |
| 51 | default: | |
| 52 | pr_err("Unknown class: %d\n", xc); | |
| 53 | return 0; | |
| 54 | } | |
| 55 | } |